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Bind multiple IP addresses to the network card of CentOS

All devices in CentOS are files. the NIC is also defined in the file. to bind an IP address, you only need to change the file. nic files are located in the directory:/etc/sysconfig/network-scripts to query the current IP information: ifconfig: eth0Linkencap: all devices in Etherne CentOS are files. the NIC is also defined in the file. to bind an IP address, you only need to change the file. nic files are in the directory: /Etc/sysconfig/network-scripts: ifconfig: eth0 Link encap: Ethernet HWad

crs-2527:unable to start ' Ora. Listener.lsnr ' because it had a ' hard ' dependency on ' ORA.CLUSTER_VIP

online online Rac2 Ora. Listener.lsnr Look at the network:[[emailprotected] bin]# ifconfigeth0 Link encap:ethernet HWaddr 08:00:27:40:4a:f0 inet addr:192.168 .56.10 bcast:192.168.56.255 mask:255.255.255.0 up broadcast RUNNING multicast mtu:1500 metric:1 RX p ackets:6071 errors:0 dropped:0 overruns:0 frame:0 TX packets:7816 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:711129 (6 94.4 KiB) TX bytes:1035971 (1011

RHEL6.4 using Udev to do NIC name binding

{speed}== "1000"attr{duplex}== "Full"attr{dormant}== "0"attr{operstate}== "Up"attr{mtu}== "1500"attr{flags}== "0x1003"attr{tx_queue_len}== "1000"..............................Refer to the above output to intercept the information that uniquely identifies the eth0 NIC and begin writing Udev rules# Vim/etc/udev/rules.d/99-nic.rulessubsystem== "NET", action== "Add", drivers== "? *", attr{address}== "00:0c:29:20:34:b9", attr{type}== "1", kernel== "eth*" ,

Summary of mtu tcp udp optimization settings in network programming

The TCP/IP protocol involves four layers: link layer, network layer, transmission layer, and application layer.The Ethernet data frame is at the link layer.IP packageAt the network layerTCP or UDP packetsAt the transport layerData in TCP or UDP(Data) at the application layerTheirLink isData frame {IP packet {TCP or UDP packet {Data }}}---------------------------------------------------------------------------------The maximum length of Data used in applications depends on the underlying limits.L

Dedicated Virtual LAN technology and application example

vlan 1 name default type ethernet mtu 1500 said 100001 state active Set vlan 100 name VLAN0100 type ethernet pvlantype primary mtu 1500 said 100100 state active Set vlan 101 name VLAN0101 type ethernet pvlantype isolated mtu 1500 said 100101 state active Set vlan 102 name VLAN0102 type ethernet pvlantype community mtu

Apache Optimization: Modify the maximum number of concurrent connections

the number of active processes when the server load is reduced. Note: in the above parameters that relate to the number of statistics requests, only the first request is counted for keepalive connections.Next, let's look at mpm_perfork mpm_worker the default configuration under modules and modules:#mpm_perfork模块 #推荐设置: small = default =20~50 large =50~100minspareservers #推荐设置: Consistent with startservers maxspareservers #推荐设置: Small =20 =30~80 la

Null in Oracle

-MAY-81 2850 30 7782 clark manager 7839 09-JUN-81 2450 10 7788 scott analyst 7566 09-DEC-82 3000 20 7839 king president 17-NOV-81 5000 10 7844 turner salesman 7698 08-SEP-81 1500 0 30 7876 adams clerk 7788 12-JAN-83 1100 20 7900 james clerk 7698 03-DEC-81 950 30 7902 ford analyst 7566 03-DEC-81 3000 20 7934 miller clerk 7782 23-JAN-82 1300 10 This article takes the preceding EMP table as an example to discuss the features of null values in daily appl

The Linux IP command

:01:bf:a0inet addr:172.16.16.173 bcast:172.16.16.255 mask:255.255.255.0Inet6 ADDR:FE80::20C:29FF:FE01:BFA0/64 Scope:linkUp broadcast RUNNING multicast mtu:1500 metric:1RX packets:27735 errors:0 dropped:0 overruns:0 frame:0TX packets:549 errors:0 dropped:0 overruns:0 carrier:0collisions:0 txqueuelen:1000RX bytes:1978580 (1.8 MiB) TX bytes:67070 (65.4 KiB)eth1 Link encap:ethernet HWaddr 00:0C:29:01:BF:AAinet addr:192.168.7.173 bcast:192.168.7.255 mask:2

Linux KVM virtual Machine nat/bridge configuration

-utilsInstalled it is time-to-look for the current network configuration. The easiest-to-do-is-to-run the ifconfig command. The following shows output from running ifconfig in a system on which KVM are installed, but on which a network bridge have Yet to be configured:Eth0 Link encap:ethernet HWaddr 00:13:72:0b:14:57inet addr:192.168.2.18 bcast:255.255.255.255 mask:255.255.255.0Inet6 ADDR:FE80::213:72FF:FE0B:1457/64 Scope:linkUp broadcast RUNNING multicast mtu:

CentOS the next card to bind multiple IP methods

All the devices in the CentOS are files. The NIC is also defined in the file. The binding of IP also requires only changes to the file. Network card related files in directory:/etc/sysconfig/network-scripts Querying Current IP information: Ifconfig Eth0 Link encap:ethernet hwaddr 00:50:56:ac:6b:0f inet addr:42.51.135.206 bcast:42.51.135.255 mask:255.255.255.0 Inet6 ADDR:FE80::250:56FF:FEAD:6B0F/64 Scope:link Up broadcast RUNNING multicast mtu:1500

MySQL exceeds maximum number of connections solution

-O max_connections=1500 The specific point is the following location: Use Description: The code is as follows Copy Code Then $NOHUP _niceness $ledir/$MySQLD$defaults--basedir= $MY _basedir_version--datadir= $DATADIR $USER _option--pid-file= $pid _file--skip-external-locking-O max_connections=1500>> $err _log 2>1 ElseEval "$NOHUP _niceness $ledir/$MySQLD$de

Install KVM on Ubuntu and build a virtual environment

KVM and virt management software~ sudo apt-get install KVM QEMU~ sudo apt-get install virtinst python-libvirt virt-viewer Virt-managerIt's really easy to install on Ubuntu. 3. Configure the bridge adapter 1) Here we use the NIC bridging method~ sudo apt-get Install bridge-utils 2) View the settings for the network card ~ ifconfig eth0 Link encap:ethernet HWaddr 00:1c:25:a1:99:fc inet addr : 192.168.1.10 bcast:192.168.1.255 mask:255.255.255.0 Inet6 addr:fe80::21c:25ff:fea1:99fc/64 scope:

MySQL Database maximum connection number 100 how to increase the number of connections

max_connections=1500 The specific point is the following location: In the Red Word special Description: Then $NOHUP _niceness $ledir/$MYSQLD $defaults--basedir= $MY _basedir_version --datadir= $DATADIR $USER _option --pid-file= $pid _file --skip-external-locking -O max_connections=1500 >> $err _log 2>1 Else Eval "$NOHUP _niceness $ledir/$MYSQLD $defaults--basedir= $MY _basedir_version --datadir

Modify MySQL 5.0.xx default connection number under Linux

This time the server crashes 2 times, has not found the reason, today to see the forum sent the wrong message, think of may be the default number of MySQL connection problems, a check sure enough, God, the default connection number is only 100, how enough ah, on the internet for half a day of information, There are said to modify the MY.CNF, there is said to modify the Safe_mysqld, tried, the former useless, the latter file can not find: The original version is different from the current version

Modify MySQL 5.0.xx default connection number under Linux

This time the server crashes 2 times, has not found the reason, today to see the forum sent the wrong message, think of may be the default number of MySQL connection problems, a check sure enough, God, the default connection number is only 100, how enough ah, on the internet for half a day of information, There are said to modify the MY.CNF, there is said to modify the Safe_mysqld, tried, the former useless, the latter file can not find: The original version is different from the current version

99 query statements commonly used in Oracle database (reproduced)

Label:1. Select * from EMP;2. Select Empno, ename, job from EMP;3. Select empno number, ename name, job work from EMP;4. Select Job from EMP;5. Select distinct job from EMP;6. Select distinct empno, job from EMP;Description: Because the employee number is not duplicated, it proves that all columns are not duplicated at this time, so duplicate columns cannot be eliminated.7. Check out the employee's number, name, and work, but the format shown: number is: 7369 employee, name is: Smith, work is: c

Oracle makes additions and deletions to the table, as well as some simple actions for the user

as y=0, that is, in the case of you, the y=2 table is the two digits after the decimal point23, according to the number of working years to find out the name and age of each employeeSelect ename, HireDate feom emp ORDER by HireDate;Select ename, HireDate feom emp order by 2; Where 2 represents the second column, which is HireDate24, to find out the number of years of work per employee, the number of years in reverse order dataSelect Ename, Rount ((sysdate-hiredate)/365,0) from emp Order by Roun

How to modify the default connections of MySQL 5.0 in Linux

MySQL tutorialDuring this time, the server crashed twice and no reason was found. I saw an error message email sent from the Forum today, remembering the problem that may be caused by the default connections of mysql, the default number of connections is only 100. How can this problem be solved? I found some information on the Internet for half a day and said I should modify my. for cnf, it is said to modify safe_mysqld and try again. The former is useless, The latter file cannot be found: the o

Scrapy Installation Introduction, scrapy Installation

Scrapy Installation Introduction, scrapy Installation I. Scrapy Introduction Scrapy is a fast high-level screen scraping and web crawler framework, used to crawl websites and extract structured data from their pages. it can be used for a wide range of purposes, from data mining to monitoring and automatic testing. Official homepage: http://www.scrapy.org/ Ii. Install Python2.7 Official homepage: http://www.python.org/ : Http://www.python.org/ftp/python/2.7.3/python-2.7.3.msi 1)Install python Ins

How to modify the default connections of MySQL5.0 in Linux _ MySQL

In Linux, how does one modify the default connections of MySQL5.0? the server crashes twice, but no reason is found. I saw an error message email sent by the forum today, remembering that it may be caused by the default connections of mysql, check it out. my god, the default number of connections is only 100. how can this problem be solved? I found some information on the Internet for a long time and said I had to modify my account. for cnf, it is said to modify safe_mysqld and try again. The fo

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